BZn15-20 Zinc Cupronickel

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What Is BZn15-20 Zinc Cupronickel?

BZn15-20 zinc cupronickel is a structural copper-nickel alloy. The alloy has a beautiful silver-white appearance, commonly known as German silver. BZn15-20 zinc cupronickel has high strength and corrosion resistance, good plasticity, and can be very good in both hot and cold conditions. It can withstand pressure processing well, has poor machinability, poor weldability, and has better elasticity than QSn6.5-0.1.

Material name: zinc-nickel alloy drawn rod (hard, 5～12mm)
Brand: BZn15-20
Standard: GB/T 4423-1992

Characteristics and scope of application

BZn15-20 structure copper-nickel alloy is used for parts and instrument parts that work in humid and corrosive environments, medical appliances, telecommunications parts, artwork, spring tubes, etc.

chemical composition

Copper Cu: 62.0～65.0	Antimony Sb: ≤0.002
Nickel+cobalt Ni+Co: 13.5～16.5	Sulfur S: ≤0.01
Zinc Zn: margin	Arsenic As: ≤0.010
Lead Pb: ≤0.02	Carbon C: ≤0.03
Phosphorus P: ≤0.005	Bismuth Bi: ≤0.002
Iron Fe: ≤0.5	Magnesium Mg: ≤0.05
Manganese Mn: ≤0.3	Note: ≤0.9 (impurities)
Silicon Si: ≤0.15

Mechanical properties

Tensile strength σb (MPa): ≥440
Elongation δ10 (%): ≥5
Note: Longitudinal room temperature tensile mechanical properties of bars
Sample size: diameter or distance between opposite sides 5～12

Heat treatment specification

The casting temperature is 1170℃; the annealing temperature is 700～750℃; the rolling hot working temperature is 950～970℃; the low temperature annealing temperature to eliminate internal stress is 250℃.